Determination of the mechanical properties of surface-modified layer of 18CrNiMo7-6 steel alloys after carburizing heat treatment

2018 ◽  
Vol 148 ◽  
pp. 84-93 ◽  
Author(s):  
MingHao Zhao ◽  
XueCheng Han ◽  
Gang Wang ◽  
GuangTao Xu
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Steel Alloys ◽  
Modified Layer ◽  
Surface Modified

Precipitation Strengthening in AA7449 Aluminium Alloy: Understanding the Relationship between Microstructure, Yield Strength and Strain Hardening

2006 ◽  
Vol 519-521 ◽  
pp. 991-996 ◽  
Author(s):  
G. Fribourg ◽  
Alexis Deschamps ◽  
Yves Bréchet
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Activation Volume ◽  
Rate Sensitivity ◽  
Work Hardening Rate ◽  
Deformation Step ◽  
Evolution Of Microstructure ◽  
Step Heat Treatment ◽  
The Relationship

This paper presents a detailed study of the microstructure and mechanical properties of AA7449 alloy during the two step heat treatment leading to the industrial T7651 temper. It is first shown that reproducing the heat treatment without a deformation step as used in the T7651 industrial temper leads to 2-fold decrease of the precipitation kinetics due to the absence of dislocations, while the resulting mechanical properties (if this change in kinetics is accounted for) are very similar. The work hardening rate is shown to strongly evolve during the heat treatment, and this evolution has been correlated to the evolution of microstructure using a Kocks-Mecking-Estrin analysis. Finally, an analysis in terms of activation volume of the strain rate sensitivity allows for the determination of the dislocation / precipitate interaction in the overaged temper.

Weldability Investigation of Temper-Grade Steels

2008 ◽  
Vol 589 ◽  
pp. 31-35
Author(s):  
Gábor Lengyel ◽  
Béla Palotás
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Heat Conduction ◽  
Heat Affected Zone ◽  
Three Dimensional ◽  
Cold Cracking ◽  
Crucial Importance ◽  
Preheat Temperature ◽  
Wide Range

The mechanical properties of temper-grade steels can be modified in a wide range by heat treatment. The principle of heat treatment lies in the good hardenability, so when such steels are welded it is very likely that the heat affected zone is hardened. Considering the fact that in the case of design simplifications it may be needed to weld temper-grade steels, as well therefore it is of crucial importance to eliminate cold cracking. There are many methods available to determine preheat temperature. The applicability of methods for determination of preheat temperature was checked by experimental welding for both two and three dimensional heat conduction. According to our experience the different methods cannot be applied in general namely they are valid only under certain conditions.

Soft polyurethanes treated by plasma immersion ion implantation: Structural and mechanical properties of the surface-modified layer

2017 ◽  
Vol 135 (11) ◽  
pp. 45983 ◽  
Author(s):  
Ilya A. Morozov ◽  
Alexander S. Mamaev ◽  
Irina V. Osorgina ◽  
Anton Y. Beliaev ◽  
Roman I. Izumov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Ion Implantation ◽  
Modified Layer ◽  
Plasma Immersion Ion Implantation ◽  
Surface Modified

Prediction of Mechanical Properties of Al-Based FGM Crash Box Fabricated by Heat Treatment Process

2013 ◽  
Vol 465-466 ◽  
pp. 647-651 ◽  
Author(s):  
Saifulnizan Jamian ◽  
Mohammad Rusydi Zainal Abidin
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Heat Treatment ◽  
Temperature Distribution ◽  
Material Properties ◽  
Interpolation Method ◽  
Functionally Graded ◽  
Local Material ◽  
Local Material Properties

In this paper, mechanical properties of Al functionally graded materials (FGMs) crash box fabricated by heat treatment is predicted based on temperature distribution and experimental data. The Al FGM crash box is fabricated by applying different temperature at the both ends of a square hollow Al column for 4 hours. Due to the gradient in heat treatment temperature along the height of the Al column, the microstructure is locally varied so that a certain variation of local material properties is achieved. The determination of material properties at any point along the height of Al FGM crash box experimentally is uneasy. The Lagrange interpolation method is proposed to predict the variation of local material properties at any point along the height of Al FGM crash box for further work such as simulation of impact on the crash box. The determination of mechanical properties is successfully predicted using the available experimental data and the temperature distribution obtained in simulation.

scholarly journals Heat Treatment of a Casting Element of a Through Clamp to Suspension of Electric Cables on Line Post Insulators

2016 ◽  
Vol 16 (3) ◽  
pp. 89-94 ◽  
Author(s):  
J. Pezda
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Structural Changes ◽  
On Line ◽  
Technological Quality ◽  
The Subject ◽  
Electric Cables ◽  
Selection Of ◽  
Energy Network

Abstract Heat treatment of a casting elements poured from silumins belongs to technological processes aimed mainly at change of their mechanical properties in solid state, inducing predetermined structural changes, which are based on precipitation processes (structural strengthening of the material), being a derivative of temperature and duration of solutioning and ageing operations. The subject-matter of this paper is the issue concerning implementation of a heat treatment process, basing on selection of dispersion hardening parameters to assure improvement of technological quality in terms of mechanical properties of a clamping element of energy network suspension, poured from hypoeutectic silumin of the LM25 brand; performed on the basis of experimental research program with use of the ATD method, serving to determination of temperature range of solutioning and ageing treatments. The heat treatment performed in laboratory conditions on a component of energy network suspension has enabled increase of the tensile strength Rm and the hardness HB with about 60-70% comparing to the casting without the heat treatment, when the casting was solutioned at temperature 520 °C for 1 hour and aged at temperature 165 °C during 3 hours.

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